JP4419321B2 - Manufacturing method of spark plug - Google Patents

Manufacturing method of spark plug Download PDF

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Publication number
JP4419321B2
JP4419321B2 JP2000395531A JP2000395531A JP4419321B2 JP 4419321 B2 JP4419321 B2 JP 4419321B2 JP 2000395531 A JP2000395531 A JP 2000395531A JP 2000395531 A JP2000395531 A JP 2000395531A JP 4419321 B2 JP4419321 B2 JP 4419321B2
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Prior art keywords
tip
chip
electrode
guide jig
spark plug
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JP2002198157A (en
Inventor
猛司 花井
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Denso Corp
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Denso Corp
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Priority to US10/011,308 priority patent/US6659826B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B23K11/004—Welding of a small piece to a great or broad piece
    • B23K11/0046—Welding of a small piece to a great or broad piece the extremity of a small piece being welded to a base, e.g. cooling studs or fins to tubes or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、所定の空隙を有して対向配置された２つの電極（中心電極及び接地電極）のうち少なくとも一方側に貴金属製のチップが溶接されたスパークプラグの製造方法に関するものである。
【０００２】
【従来の技術】
図４は従来の技術に係るチップの溶接方法を示す説明図であり、従来では、先端にチップ３ａが挿入される穴部を有するガイド治具１０にてチップ３ａを電極（この例では、接地電極３）に位置決め配置した後（図４（ａ）参照）、チップを接地電極３上に残した状態でガイド治具を上方側に平行移動させ、その後、電気溶接用の溶接電極２０にてチップを押圧した状態で電気溶接（抵抗溶接）していた（図４（ｂ）参照）。
【０００３】
【発明が解決しようとする課題】
ところで、上述の溶接方法では、チップを接地電極に位置決め配置した後、チップを接地電極上に残した状態でガイド治具を上方側に平行移動させるので、ガイド治具を移動させる場合に、チップが動いてしまう可能性が高い。
【０００４】
これに対して、ガイド治具に設けられた穴部の大きさ（直径）を、チップの大きさ（直径）に比べて十分に大きくすればよいが、穴部の大きさ（直径）を、チップの大きさ（直径）に比べて十分に大きくすると、接地電極に対するチップの位置決め精度が低下してしまい、電極間の距離がばらついてしまう。
【０００５】
本発明は、上記点に鑑み、チップを精度良く電極に位置決めした状態でチップを電極に溶接することを目的とする。
【０００６】
【課題を解決するための手段】
本発明は、上記目的を達成するために、請求項１に記載の発明では、所定の空隙を有して対向配置された２つの電極（２、３）のうち少なくとも一方側に貴金属製のチップ（３ａ）が溶接され、２つの電極（２、３）間で火花を発生させるスパークプラグの製造方法であって、チップ（３ａ）の軸方向寸法（ｈ）より小さい厚み寸法（ｔ）を有する板状のガイド治具（１０）にて、軸方向と直交する方向からチップ（３ａ）を挟み込むようにしてチップ（３ａ）を電極（３）に位置決め配置する第１工程と、電気溶接用の溶接電極（２０）にて、ガイド治具（１０）にて位置決め配置されたチップ（３ａ）を電極（３）側に押圧する第２工程と、第２工程が終了した後、ガイド治具（１０）を軸方向と直交する方向に移動させてガイド治具（１０）をチップ（３ａ）から離す第３工程と、第３工程のが終了した後、溶接電極（２０）に通電し、チップ（３ａ）を電極に溶接する第４工程とを有することを特徴とする。
【０００７】
これにより、本発明では、ガイド治具（１０）を軸方向と直交する方向に移動させてガイド治具（１０）をチップ（３ａ）から離すので、ガイド治具（１０）をチップ（３ａ）から離す際にチップ（３ａ）が移動してしまうことを防止できる。
【０００８】
したがって、チップ（３ａ）を精度良く電極（３）に位置決めした状態でチップ（３ａ）を電極（３）に溶接することができるので、両電極（２、３）間の距離のばらつきを小さくすることができる。
【０００９】
また、溶接電極（２０）にてチップ（３ａ）を押圧した状態でガイド治具（１０）をチップ（３ａ）から離すので、ガイド治具（１０）をチップ（３ａ）から離す際にチップ（３ａ）が移動してしまうことをより確実に防止できる。延いては、両電極（２、３）間の距離のばらつきを小さくすることができる。
【００１０】
請求項２に記載の発明では、所定の空隙を有して対向配置された２つの電極（２、３）のうち少なくとも一方側に貴金属製のチップが溶接され、２つの電極（２、３）間で火花を発生させるスパークプラグの製造方法であって、板状のガイド治具（１０）にて、チップ（３ａ）の軸方向と直交する方向からチップ（３ａ）を挟み込むようにしてチップ（３ａ）を電極（３）に位置決め配置する第１工程と、第１工程が終了した後、ガイド治具（１０）を軸方向と直交する方向に移動させてガイド治具（１０）をチップ（３ａ）から離す第２工程と、電気溶接用の溶接電極（２０）にてチップ（３ａ）を電極（３）側に押圧する第３工程と、第３工程のが終了した後、溶接電極（２０）に通電し、チップ（３ａ）を電極に溶接する第４工程とを有することを特徴とする。
【００１１】
これにより、本発明では、ガイド治具（１０）を軸方向と直交する方向に移動させてガイド治具（１０）をチップ（３ａ）から離すので、ガイド治具（１０）をチップ（３ａ）から離す際にチップ（３ａ）が移動してしまうことを防止できる。
【００１２】
したがって、チップ（３ａ）を精度良く電極（３）に位置決めした状態でチップ（３ａ）を電極（３）に溶接することができるので、両電極（２、３）間の距離のばらつきを小さくすることができる。
【００１３】
なお、請求項２に記載の発明においては、請求項３に記載の発明のごとくチップ（３ａ）の軸方向寸法（ｈ）より小さい厚み寸法（ｔ）を有するガイド治具（１０）にてチップ（３ａ）を挟み込むことが望ましい。
【００１４】
請求項４に記載の発明では、第１工程においては、先端側に切り欠き部（１１ａ）が形成されたガイド治具（１０）にてチップ（３ａ）を挟み込むことを特徴とする。
【００１５】
これにより、チップ（３ａ）を挟み込む（チャキングする）際に、チップ（３ａ）を自動調芯するように所定の位置に配置することができる。
【００１６】
因みに、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示す一例である。
【００１７】
【発明の実施の形態】
（第１実施形態）
本実施形態は、本発明に係るスパークプラグの製造方法を内燃機関用のスパークプラグの製造方法に適用したものであって、図１は車両用内燃機関（エンジン）に用いられるスパークプラグ１の断面図である。
【００１８】
ここで、スパークプラグ１は、中心電極２、中心電極２を挟んで対向配置された２本の接地電極３、接地電極３が溶接された略円筒状のハウジング４、アルミナセラミック（Ａｌ2Ｏ3）等の電気絶縁体からなる碍子５、端子部６が設けられた金属製のステム７、及び碍子５内においてステム７と中心電極２との間に位置して所定の電気抵抗値を有するレジスタ８等からなるものである。
【００１９】
なお、中心電極２は、例えば、内材がＣｕ等の熱伝導性に優れた金属材料、外材がＮｉ基合金等の耐熱性および耐食性に優れた金属材料により構成された円柱体で、その先端部２ａが碍子５から接地電極３側に露出している。
【００２０】
また、接地電極３はＮｉを主成分とするＮｉ基合金からなるもので、その一端部がハウジング４に溶接された状態で略９０°（略Ｌ字状に）曲げられて、他端部に貴金属（本実施形態では、白金）製のチップ３ａが溶接されて中心電極２の先端部２ａと所定の空隙を有して離隔している。
【００２１】
また、レジスタ８は、炭素粉末を混合したガラスを主成分する粉末状の抵抗材を炉内に焼き固めて（焼結して）円柱状に形成したもので、その長手方向両端側には、導電性ガラスからなるガラスシール層８ａ、８ｂを設けることにより中心電極２側（燃焼室内）と端子６側（燃焼室外）とが連通してしまうことを防止している。
【００２２】
因みに、ハウジング４は、碍子５内にレジスタ８を形成した後、ハウジング４の一部をカシメる（塑性変形させる）ことにより碍子５に機械的に固定されている。
【００２３】
次に、チップ３ａを接地電極３に電気溶接（抵抗溶接）する場合を例に本実施形態に係るチップの溶接方法（スパークプラグの製造方法）について述べる。
【００２４】
図２は本実施形態に係るチップの溶接方法の特徴を示す説明図であり、１０はチップ３ａの軸方向寸法ｈより小さい厚み寸法ｔを有する板状のガイド治具であり、このガイド治具１０は、チップ３ａ側の端部に略三角状の切欠き部１１ａが形成された第１ガイド１１、及びチップ３ａ側が単純な矩形状に形成された第２ガイド１２からなるものである。因みに、本実施形態では、薄く、かつ、じん性に優れたゲージ用鋼板にてガイド治具１０を構成している。
【００２５】
なお、本実施形態では、チップ３ａの座りを良くするために、図１（ｂ）に示すように凹部３ｂを設けているので、本実施形態では、ガイド治具１０の厚みは、チップ３ａ軸方向寸法から凹部３ｂの深さを差し引いた値より小さくする必要がある。
【００２６】
そして、チップ３ａを溶接するにあたっては、チップ３ａの軸方向と直交する方向からガイド治具１０にてチップ３ａを挟み込むんで（クランプして）、チップ（３ａ）を接地電極３に位置決め配置する（第１工程）。
【００２７】
次に、電気溶接用の溶接電極２０にて、ガイド治具１０にて位置決め配置されたチップ３ａを接地電極３側に押圧し（第２工程）、チップ３ａを溶接電極２０にて押圧した状態のまま、ガイド治具１０を軸方向と直交する方向に移動させてガイド治具１０をチップ３ａから離す（第３工程）。そして、溶接電極２０に通電してチップ３ａを溶接電極にて加圧しながら、チップ３ａを接地電極３に溶接する（第４工程）。
【００２８】
なお、本実施形態では、溶接電極２０にてチップ３ａを加圧しながら溶接するので、溶接終了後においては、図１（ｂ）に示すように、チップ３ａと接地電極３との段差は殆ど無くなる。
【００２９】
次に、本実施形態の特徴（作用効果）を述べる。
【００３０】
本実施形態によれば、ガイド治具１０を軸方向と直交する方向に移動させてガイド治具１０をチップ３ａから離すので、ガイド治具１０をチップ３ａから離す際にチップ３ａが移動してしまうことを防止できる。
【００３１】
したがって、チップ３ａを精度良く接地電極３に位置決めした状態でチップ３ａを接地電極３に溶接することができるので、中心電極２と接地電極３（チップ３ａ）とのエアギャップ（距離）のばらつきを小さくすることができる。
【００３２】
また、溶接電極２０にてチップ３ａを加圧した状態でガイド治具１０をチップ３ａから離すので、ガイド治具１０をチップ３ａから離す際にチップ３ａが移動してしまうことをより確実に防止できる。延いては、中心電極２と接地電極３（チップ３ａ）とのエアギャップ（距離）のばらつきをより一層小さくすることができる。
【００３３】
また、ガイド治具１０（本実施形態では、第１ガイド１１）に切欠き部（案内溝）１１ａが設けられているので、チップ３ａを挟み込む（チャキングする）際に、チップ３ａを自動調芯するように所定の位置に配置することができる。
【００３４】
（第２実施形態）
第１実施形態では、溶接電極２０にてチップ３ａを加圧した状態でガイド治具１０をチップ３ａから離したが、本実施形態では、上記の第２工程と第３工程とを入れ替えて、ガイド治具１０をチップ３ａから離したた後、溶接電極２０にてチップ３ａを加圧して溶接するようにしたものである。
【００３５】
そして、本実施形態においても、ガイド治具１０を軸方向と直交する方向に移動させてガイド治具１０をチップ３ａから離すので、ガイド治具１０をチップ３ａから離す際にチップ３ａが移動してしまうことを防止できる。
【００３６】
（その他の実施形態）
ところで、上述の実施形態では、第１ガイド１１に切り欠き１１ａを設けたが、本発明はこれに限定されるものではなく、図３（ａ）、（ｂ）に示すように、両ガイド１１、１２に切欠き部１１ａを設けてもよい。
【００３７】
また、上述の実施形態では、切欠き部１１ａを三角状としたが、本発明はこれに限定されるものではなく、図３（ｃ）、（ｄ）に示すように、半円状や台形状等のその他形状であってもよい。
【００３８】
また、上述の実施形態では、接地電極３に溶接されるチップ３ａを例に本発明の実施形態を説明したが、中心電極２に溶接されるチップに対して本発明を適用してもよい。
【図面の簡単な説明】
【図１】本発明の実施形態に係るスパークプラグの半断面図である。
【図２】本発明の第１実施形態に係るスパークプラグの製造装置の模式図である。
【図３】本発明の第１実施形態に係るスパークプラグの製造装置に適用されるガイド治具の模式図である。
【図４】本発明の第１実施形態に係るスパークプラグの製造装置の模式図である。
【符号の説明】
３…接地電極、３ａ…チップ、１０…ガイド治具。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a spark plug in which a noble metal tip is welded to at least one side of two electrodes (a center electrode and a ground electrode) arranged to face each other with a predetermined gap.
[0002]
[Prior art]
FIG. 4 is an explanatory view showing a tip welding method according to the prior art. Conventionally, the tip 3a is electroded by a guide jig 10 having a hole into which the tip 3a is inserted at the tip (in this example, grounding). After the positioning and positioning on the electrode 3) (see FIG. 4A), the guide jig is translated upward with the tip left on the ground electrode 3, and then the welding electrode 20 for electric welding is used. Electric welding (resistance welding) was performed with the tip pressed (see FIG. 4B).
[0003]
[Problems to be solved by the invention]
By the way, in the above-described welding method, after the tip is positioned on the ground electrode, the guide jig is translated upward with the tip left on the ground electrode. Is likely to move.
[0004]
On the other hand, the size (diameter) of the hole provided in the guide jig may be sufficiently larger than the size (diameter) of the chip, but the size of the hole (diameter) If it is sufficiently larger than the size (diameter) of the chip, the positioning accuracy of the chip with respect to the ground electrode is lowered, and the distance between the electrodes varies.
[0005]
An object of this invention is to weld a chip | tip to an electrode in the state which positioned the chip | tip on the electrode accurately in view of the said point.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a tip made of a noble metal is provided on at least one side of two electrodes (2, 3) arranged to face each other with a predetermined gap. (3a) is a method of manufacturing a spark plug in which a spark is generated between two electrodes (2, 3) and has a thickness dimension (t) smaller than the axial dimension (h) of the tip (3a). A first step of positioning and disposing the tip (3a) on the electrode (3) so as to sandwich the tip (3a) from a direction orthogonal to the axial direction with a plate-shaped guide jig (10); A second step of pressing the tip (3a) positioned and arranged by the guide jig (10) to the electrode (3) side with the welding electrode (20), and a guide jig ( 10) Move the guide jig (in the direction perpendicular to the axial direction) 0) is separated from the tip (3a), and after the third step is finished, the welding electrode (20) is energized, and the fourth step is to weld the tip (3a) to the electrode. And
[0007]
Accordingly, in the present invention, the guide jig (10) is moved in the direction orthogonal to the axial direction to separate the guide jig (10) from the chip (3a), so that the guide jig (10) is moved to the chip (3a). It is possible to prevent the tip (3a) from moving when separated from the chip.
[0008]
Therefore, since the tip (3a) can be welded to the electrode (3) in a state where the tip (3a) is accurately positioned to the electrode (3), variation in the distance between the electrodes (2, 3) is reduced. be able to.
[0009]
Further, since the guide jig (10) is separated from the chip (3a) in a state where the chip (3a) is pressed by the welding electrode (20), the chip (10) is separated when the guide jig (10) is separated from the chip (3a). It can prevent more reliably that 3a) will move. As a result, the variation in the distance between the electrodes (2, 3) can be reduced.
[0010]
In the invention described in claim 2, a noble metal tip is welded to at least one side of two electrodes (2, 3) arranged to face each other with a predetermined gap, and the two electrodes (2, 3). A spark plug manufacturing method for generating a spark between the chip (3a) by sandwiching the chip (3a) from a direction orthogonal to the axial direction of the chip (3a) with a plate-shaped guide jig (10) ( After the first step of positioning and arranging 3a) on the electrode (3) and the first step are finished, the guide jig (10) is moved in a direction perpendicular to the axial direction to insert the guide jig (10) into the chip ( 3a), the third step of pressing the tip (3a) toward the electrode (3) with the welding electrode (20) for electric welding, and the third step, the welding electrode ( 20), and a fourth step of welding the tip (3a) to the electrode Characterized in that it.
[0011]
Accordingly, in the present invention, the guide jig (10) is moved in the direction orthogonal to the axial direction to separate the guide jig (10) from the chip (3a), so that the guide jig (10) is moved to the chip (3a). It is possible to prevent the tip (3a) from moving when separated from the chip.
[0012]
Therefore, since the tip (3a) can be welded to the electrode (3) in a state where the tip (3a) is accurately positioned to the electrode (3), variation in the distance between the electrodes (2, 3) is reduced. be able to.
[0013]
In the second aspect of the invention, as in the third aspect of the invention, the chip is formed by the guide jig (10) having a thickness dimension (t) smaller than the axial dimension (h) of the chip (3a). It is desirable to sandwich (3a).
[0014]
The invention according to claim 4 is characterized in that, in the first step, the chip (3a) is sandwiched by a guide jig (10) having a notch (11a) formed on the tip side.
[0015]
Thereby, when the chip (3a) is sandwiched (chucked), the chip (3a) can be arranged at a predetermined position so as to be automatically aligned.
[0016]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
In this embodiment, the method for manufacturing a spark plug according to the present invention is applied to a method for manufacturing a spark plug for an internal combustion engine. FIG. 1 is a cross-sectional view of a spark plug 1 used for an internal combustion engine (engine) for a vehicle. FIG.
[0018]
Here, the spark plug 1 includes a center electrode 2, two ground electrodes 3 arranged opposite to each other with the center electrode 2 interposed therebetween, a substantially cylindrical housing 4 to which the ground electrode 3 is welded, an alumina ceramic (Al 2 O 3). ) And the like, a metal stem 7 provided with a terminal 6, and a resistor having a predetermined electric resistance value located between the stem 7 and the center electrode 2 in the insulator 5. 8 mag.
[0019]
The center electrode 2 is, for example, a cylindrical body made of a metal material having excellent heat conductivity such as Cu as an inner material and a metal material having excellent heat resistance and corrosion resistance such as a Ni-based alloy as an outer material. The portion 2a is exposed from the insulator 5 to the ground electrode 3 side.
[0020]
The ground electrode 3 is made of a Ni-based alloy containing Ni as a main component. One end of the ground electrode 3 is bent by approximately 90 ° (substantially L-shaped) while being welded to the housing 4, and the other end is bent. A tip 3a made of a noble metal (in this embodiment, platinum) is welded and separated from the tip 2a of the center electrode 2 with a predetermined gap.
[0021]
In addition, the resistor 8 is a cylindrical resistor formed by baking (sintering) a powdered resistance material mainly composed of glass mixed with carbon powder in a furnace. By providing the glass sealing layers 8a and 8b made of conductive glass, the center electrode 2 side (combustion chamber) and the terminal 6 side (outside the combustion chamber) are prevented from communicating with each other.
[0022]
Incidentally, the housing 4 is mechanically fixed to the insulator 5 by forming a resistor 8 in the insulator 5 and then caulking (plastically deforming) a part of the housing 4.
[0023]
Next, the tip welding method (spark plug manufacturing method) according to this embodiment will be described by taking as an example the case where the tip 3a is electrically welded (resistance welding) to the ground electrode 3.
[0024]
FIG. 2 is an explanatory view showing the features of the tip welding method according to the present embodiment, and 10 is a plate-like guide jig having a thickness dimension t smaller than the axial dimension h of the chip 3a. 10 includes a first guide 11 in which a substantially triangular cutout portion 11a is formed at an end portion on the chip 3a side, and a second guide 12 in which the chip 3a side is formed in a simple rectangular shape. Incidentally, in the present embodiment, the guide jig 10 is formed of a gauge steel plate that is thin and excellent in toughness.
[0025]
In this embodiment, since the recess 3b is provided as shown in FIG. 1B in order to improve the sitting of the chip 3a, in this embodiment, the thickness of the guide jig 10 is the tip 3a axis. It is necessary to make it smaller than the value obtained by subtracting the depth of the recess 3b from the directional dimension.
[0026]
When the tip 3a is welded, the tip 3a is sandwiched (clamped) by the guide jig 10 from the direction orthogonal to the axial direction of the tip 3a, and the tip (3a) is positioned and arranged on the ground electrode 3 ( First step).
[0027]
Next, with the welding electrode 20 for electric welding, the tip 3a positioned and arranged by the guide jig 10 is pressed to the ground electrode 3 side (second step), and the tip 3a is pressed by the welding electrode 20 The guide jig 10 is moved in the direction orthogonal to the axial direction to move the guide jig 10 away from the chip 3a (third step). Then, the chip 3a is welded to the ground electrode 3 while energizing the welding electrode 20 and pressurizing the chip 3a with the welding electrode (fourth step).
[0028]
In the present embodiment, since the tip 3a is welded while being pressurized with the welding electrode 20, the step between the tip 3a and the ground electrode 3 is almost eliminated after the end of the welding as shown in FIG. .
[0029]
Next, features (effects) of this embodiment will be described.
[0030]
According to the present embodiment, the guide jig 10 is moved in the direction orthogonal to the axial direction to separate the guide jig 10 from the chip 3a. Therefore, when the guide jig 10 is separated from the chip 3a, the chip 3a is moved. Can be prevented.
[0031]
Therefore, since the tip 3a can be welded to the ground electrode 3 with the tip 3a positioned on the ground electrode 3 with high accuracy, the variation in the air gap (distance) between the center electrode 2 and the ground electrode 3 (tip 3a) can be reduced. Can be small.
[0032]
Further, since the guide jig 10 is separated from the chip 3a in a state where the chip 3a is pressed by the welding electrode 20, the chip 3a is more reliably prevented from moving when the guide jig 10 is separated from the chip 3a. it can. As a result, variation in the air gap (distance) between the center electrode 2 and the ground electrode 3 (chip 3a) can be further reduced.
[0033]
Further, since the notch (guide groove) 11a is provided in the guide jig 10 (in this embodiment, the first guide 11), the chip 3a is automatically aligned when the chip 3a is sandwiched (chucked). It can be arranged at a predetermined position.
[0034]
(Second Embodiment)
In the first embodiment, the guide jig 10 is separated from the tip 3a in a state where the tip 3a is pressurized with the welding electrode 20, but in the present embodiment, the second step and the third step are replaced, After the guide jig 10 is separated from the tip 3a, the tip 3a is pressurized and welded by the welding electrode 20.
[0035]
Also in this embodiment, since the guide jig 10 is moved in the direction orthogonal to the axial direction to separate the guide jig 10 from the chip 3a, the chip 3a moves when the guide jig 10 is separated from the chip 3a. Can be prevented.
[0036]
(Other embodiments)
By the way, in the above-mentioned embodiment, the notch 11a was provided in the 1st guide 11, However, This invention is not limited to this, As shown to Fig.3 (a), (b), both guide 11 is shown. , 12 may be provided with a notch 11a.
[0037]
Further, in the above-described embodiment, the cutout portion 11a is triangular, but the present invention is not limited to this, and as shown in FIGS. Other shapes such as a shape may be used.
[0038]
In the above embodiment, the embodiment of the present invention has been described by taking the tip 3 a welded to the ground electrode 3 as an example. However, the present invention may be applied to the tip welded to the center electrode 2.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a spark plug according to an embodiment of the present invention.
FIG. 2 is a schematic view of the spark plug manufacturing apparatus according to the first embodiment of the present invention.
FIG. 3 is a schematic view of a guide jig applied to the spark plug manufacturing apparatus according to the first embodiment of the present invention.
FIG. 4 is a schematic view of the spark plug manufacturing apparatus according to the first embodiment of the present invention.
[Explanation of symbols]
3 ... ground electrode, 3a ... chip, 10 ... guide jig.

Claims (5)

所定の空隙を有して対向配置された２つの電極（２、３）のうち少なくとも一方側に貴金属製のチップ（３ａ）が溶接され、前記２つの電極（２、３）間で火花を発生させるスパークプラグの製造方法であって、
前記チップ（３ａ）の軸方向寸法（ｈ）より小さい厚み寸法（ｔ）を有する板状のガイド治具（１０）にて、前記軸方向と直交する方向から前記チップ（３ａ）を挟み込むようにして前記チップ（３ａ）を前記電極（３）に位置決め配置する第１工程と、
電気溶接用の溶接電極（２０）にて、前記ガイド治具（１０）にて位置決め配置された前記チップ（３ａ）を前記電極（３）側に押圧する第２工程と、
前記第２工程が終了した後、前記ガイド治具（１０）を前記軸方向と直交する方向に移動させて前記ガイド治具（１０）を前記チップ（３ａ）から離す第３工程と、
前記第３工程のが終了した後、前記溶接電極（２０）に通電し、前記チップ（３ａ）を前記電極に溶接する第４工程とを有することを特徴とするスパークプラグの製造方法。A noble metal tip (3a) is welded to at least one side of two electrodes (2, 3) arranged to face each other with a predetermined gap, and a spark is generated between the two electrodes (2, 3). A method of manufacturing a spark plug
The plate (3a) is sandwiched from a direction orthogonal to the axial direction by a plate-shaped guide jig (10) having a thickness (t) smaller than the axial dimension (h) of the chip (3a). A first step of positioning the tip (3a) on the electrode (3);
A second step of pressing the tip (3a) positioned and arranged by the guide jig (10) toward the electrode (3) with a welding electrode (20) for electric welding;
After the second step is finished, a third step of moving the guide jig (10) in a direction orthogonal to the axial direction to separate the guide jig (10) from the chip (3a);
A fourth method of manufacturing a spark plug, comprising: energizing the welding electrode (20) after the third step is completed and welding the tip (3a) to the electrode. 所定の空隙を有して対向配置された２つの電極（２、３）のうち少なくとも一方側に貴金属製のチップが溶接され、前記２つの電極（２、３）間で火花を発生させるスパークプラグの製造方法であって、
板状のガイド治具（１０）にて、前記チップ（３ａ）の軸方向と直交する方向から前記チップ（３ａ）を挟み込むようにして前記チップ（３ａ）を前記電極（３）に位置決め配置する第１工程と、
前記第１工程が終了した後、前記ガイド治具（１０）を前記軸方向と直交する方向に移動させて前記ガイド治具（１０）を前記チップ（３ａ）から離す第２工程と、
電気溶接用の溶接電極（２０）にて前記チップ（３ａ）を前記電極（３）側に押圧する第３工程と、
前記第３工程のが終了した後、前記溶接電極（２０）に通電し、前記チップ（３ａ）を前記電極に溶接する第４工程とを有することを特徴とするスパークプラグの製造方法。A spark plug in which a noble metal tip is welded to at least one side of two electrodes (2, 3) arranged to face each other with a predetermined gap to generate a spark between the two electrodes (2, 3). A manufacturing method of
With the plate-shaped guide jig (10), the chip (3a) is positioned and arranged on the electrode (3) so as to sandwich the chip (3a) from a direction orthogonal to the axial direction of the chip (3a). The first step;
After the first step is completed, the second step of moving the guide jig (10) in a direction perpendicular to the axial direction to separate the guide jig (10) from the chip (3a);
A third step of pressing the tip (3a) toward the electrode (3) with a welding electrode (20) for electric welding;
A fourth method of manufacturing a spark plug, comprising: energizing the welding electrode (20) after the third step is completed and welding the tip (3a) to the electrode. 前記第１工程においては、前記チップ（３ａ）の軸方向寸法（ｈ）より小さい厚み寸法（ｔ）を有する前記ガイド治具（１０）にて前記チップ（３ａ）を挟み込むことを特徴とする請求項２に記載のスパークプラグの製造方法。In the first step, the chip (3a) is sandwiched by the guide jig (10) having a thickness dimension (t) smaller than the axial dimension (h) of the chip (3a). Item 3. A method for producing a spark plug according to Item 2. 前記第１工程においては、先端側に切り欠き部（１１ａ）が形成された前記ガイド治具（１０）にて前記チップ（３ａ）を挟み込むことを特徴とする請求項１ないし３のいずれか１つに記載のスパークプラグの製造方法。The said 1st process WHEREIN: The said chip | tip (3a) is inserted | pinched with the said guide jig (10) by which the notch part (11a) was formed in the front end side, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. A method for producing a spark plug according to claim 1. 前記第１工程においては、略三角状の前記切り欠き部（３ａ）を有する前記ガイド治具（１０）にて前記チップ（３ａ）を挟み込むことを特徴とする請求項４に記載のスパークプラグの製造方法。5. The spark plug according to claim 4, wherein in the first step, the tip (3 a) is sandwiched by the guide jig (10) having the substantially triangular cutout portion (3 a). 6. Production method.
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